rastvori

tinC's picture

mz help? 

Koliko je grama 12%-og rasvora KOH i 6%-og rastvora KOH potrebno za pripremanje 200g 10%-og rastvora?

milicaradenkovic's picture

mr=200 g w=10%

mr1+mr2=mr

200=mr1+mr2

ms=ms1+ms2

ms=w*mr=200*0.1=20 g

20=mr1*w1+mr2*w2

20=0.12*mr1+0.06*mr2

mr2=200-mr1

20=0.12*mr1+0.06*(200-mr1)

20-12=0.06*mr1

mr1=8/0.06=133.33 g 12 % rastvora KOH

mr2=200-133.33=66.67 g 6 % rastvora KOH

tinC's picture

hvala jos jednom.. :)